Re: [PATCH] xfs: remove experimental tag for reflinks

[Eric Sandeen <sandeen@redhat.com>]

On 8/31/17 10:31 AM, Darrick J. Wong wrote:
> On Thu, Aug 31, 2017 at 03:30:19PM +0200, Christoph Hellwig wrote:
>> On Thu, Aug 31, 2017 at 08:43:21AM -0400, Brian Foster wrote:
>>> FWIW, I don't really have a strong opinion. To me, removing experimental
>>> means we feel the code has stabilized long enough in principle, there
>>> are no significant problems (i.e., corruption/crash vectors) that we are
>>> aware of and the feature is complete (full userspace tool support, etc).
>>> The in-core extent list thing seems like more of a general problem to me
>>
>> Agreed so far.
> 
> <nod> Dave?  Eric?  Any perspective you'd like to offer? :)

This is a bit of a naiive question, but how many applications are out
there that can be used with reflink right now?  This would obviously
delay things a bit, but I had considered writing something up for
LWN or Fedora Planet or $WHATEVER describing these new xfs features,
how they can be used, and encourage some early-adopter testing.  Try
to get some buzz going and some real-world use.

It's always a catch 22; nobody uses it until it's marked stable,
but we never know if it's really stable until people outside the
development community use it.  ;)

As for the allocation issues w/ the in core extent list, yeah, that
worries me.

-Eric